package org.andengine.entity.primitive;

import android.opengl.GLES20;

import org.andengine.engine.camera.Camera;
import org.andengine.entity.primitive.vbo.HighPerformanceMeshVertexBufferObject;
import org.andengine.entity.primitive.vbo.IMeshVertexBufferObject;
import org.andengine.entity.shape.IShape;
import org.andengine.entity.shape.RectangularShape;
import org.andengine.entity.shape.Shape;
import org.andengine.opengl.shader.PositionColorShaderProgram;
import org.andengine.opengl.shader.constants.ShaderProgramConstants;
import org.andengine.opengl.util.GLState;
import org.andengine.opengl.vbo.DrawType;
import org.andengine.opengl.vbo.VertexBufferObjectManager;
import org.andengine.opengl.vbo.attribute.VertexBufferObjectAttribute;
import org.andengine.opengl.vbo.attribute.VertexBufferObjectAttributes;
import org.andengine.opengl.vbo.attribute.VertexBufferObjectAttributesBuilder;
import org.andengine.util.exception.MethodNotSupportedException;

/**
 * (c) Zynga 2012
 *
 * @author Nicolas Gramlich <ngramlich@zynga.com>
 * @since 16:44:50 - 09.02.2012
 */
public class Mesh extends Shape {
    // ===========================================================
    // Constants
    // ===========================================================

    public static final int VERTEX_INDEX_X = 0;
    public static final int VERTEX_INDEX_Y = Mesh.VERTEX_INDEX_X + 1;
    public static final int COLOR_INDEX = Mesh.VERTEX_INDEX_Y + 1;

    public static final int VERTEX_SIZE = 2 + 1;

    public static final VertexBufferObjectAttributes VERTEXBUFFEROBJECTATTRIBUTES_DEFAULT = new VertexBufferObjectAttributesBuilder(2)
            .add(ShaderProgramConstants.ATTRIBUTE_POSITION_LOCATION, ShaderProgramConstants.ATTRIBUTE_POSITION, 2, GLES20.GL_FLOAT, false)
            .add(ShaderProgramConstants.ATTRIBUTE_COLOR_LOCATION, ShaderProgramConstants.ATTRIBUTE_COLOR, 4, GLES20.GL_UNSIGNED_BYTE, true)
            .build();

    // ===========================================================
    // Fields
    // ===========================================================

    protected final IMeshVertexBufferObject mMeshVertexBufferObject;
    private int mVertexCountToDraw;
    private int mDrawMode;

    // ===========================================================
    // Constructors
    // ===========================================================

    /**
     * Uses a default {@link HighPerformanceMeshVertexBufferObject} in {@link DrawType#STATIC} with the {@link VertexBufferObjectAttribute}s: {@link Mesh#VERTEXBUFFEROBJECTATTRIBUTES_DEFAULT}.
     */
    public Mesh(final float pX, final float pY, final float[] pBufferData, final int pVertexCount, final DrawMode pDrawMode, final VertexBufferObjectManager pVertexBufferObjectManager) {
        this(pX, pY, pBufferData, pVertexCount, pDrawMode, pVertexBufferObjectManager, DrawType.STATIC);
    }

    /**
     * Uses a default {@link HighPerformanceMeshVertexBufferObject} with the {@link VertexBufferObjectAttribute}s: {@link Mesh#VERTEXBUFFEROBJECTATTRIBUTES_DEFAULT}.
     */
    public Mesh(final float pX, final float pY, final float[] pBufferData, final int pVertexCount, final DrawMode pDrawMode, final VertexBufferObjectManager pVertexBufferObjectManager, final DrawType pDrawType) {
        this(pX, pY, pVertexCount, pDrawMode, new HighPerformanceMeshVertexBufferObject(pVertexBufferObjectManager, pBufferData, pVertexCount, pDrawType, true, Mesh.VERTEXBUFFEROBJECTATTRIBUTES_DEFAULT));
    }

    public Mesh(final float pX, final float pY, final int pVertexCount, final DrawMode pDrawMode, final IMeshVertexBufferObject pMeshVertexBufferObject) {
        super(pX, pY, PositionColorShaderProgram.getInstance());

        this.mDrawMode = pDrawMode.getDrawMode();
        this.mMeshVertexBufferObject = pMeshVertexBufferObject;
        this.mVertexCountToDraw = pVertexCount;

        this.mMeshVertexBufferObject.setDirtyOnHardware();

        this.setBlendingEnabled(true);
    }

    // ===========================================================
    // Getter & Setter
    // ===========================================================

    public float[] getBufferData() {
        return this.mMeshVertexBufferObject.getBufferData();
    }

    public void setVertexCountToDraw(final int pVertexCountToDraw) {
        this.mVertexCountToDraw = pVertexCountToDraw;
    }

    public void setDrawMode(final DrawMode pDrawMode) {
        this.mDrawMode = pDrawMode.mDrawMode;
    }

    // ===========================================================
    // Methods for/from SuperClass/Interfaces
    // ===========================================================

    @Override
    public IMeshVertexBufferObject getVertexBufferObject() {
        return this.mMeshVertexBufferObject;
    }

    @Override
    protected void preDraw(final GLState pGLState, final Camera pCamera) {
        super.preDraw(pGLState, pCamera);

        this.mMeshVertexBufferObject.bind(pGLState, this.mShaderProgram);
    }

    @Override
    protected void draw(final GLState pGLState, final Camera pCamera) {
        this.mMeshVertexBufferObject.draw(this.mDrawMode, this.mVertexCountToDraw);
    }

    @Override
    protected void postDraw(final GLState pGLState, final Camera pCamera) {
        this.mMeshVertexBufferObject.unbind(pGLState, this.mShaderProgram);

        super.postDraw(pGLState, pCamera);
    }

    @Override
    protected void onUpdateColor() {
        this.mMeshVertexBufferObject.onUpdateColor(this);
    }

    @Override
    protected void onUpdateVertices() {
        this.mMeshVertexBufferObject.onUpdateVertices(this);
    }

    @Override
    @Deprecated
    public boolean contains(final float pX, final float pY) {
        throw new MethodNotSupportedException();
    }

    @Override
    public boolean collidesWith(final IShape pOtherShape) {
        if (pOtherShape instanceof Line) {
            // TODO
            return false;
        } else if (pOtherShape instanceof RectangularShape) {
            // TODO
            return false;
        } else {
            return false;
        }
    }

    // ===========================================================
    // Methods
    // ===========================================================

    // ===========================================================
    // Inner and Anonymous Classes
    // ===========================================================
}